I guess it's time for an update.
Max was progressing wonderfully, I could see his feathers starting to come back and he seemed very happy, many thanks to all of the suggestions and tips from this forum.
I've been home sick with the flu for the past two days. Yesterday morning, all was well, he was talkative and his "usual" self, and then in the afternoon he was at the bottom of his cage, struggling for life! I don't know what could have happened and it happened so fast and so unexpectedly. I felt like there was nothing I could do for him, I wrapped him in a towel and had a friend drive us to the vet, but his vet (which happens to be the closest one to us) is 40 minutes away. He died in my arms on the way down there.
I can't believe this is happening, I had no idea anything was wrong and now he is gone. My house is too quiet now, it's so hard to be here. He always says Good Morning to me every morning and this morning, he wasn't there.
The vet is going to see what happened and I should know something this afternoon, but I decided to have him privately cremated so that I can bury his ashes at my parent's house in Texas (where I grew up). I'd like to plant a tree in my parents backyard for him.
I just can't believe that he's gone now... so fast.
Matt